Well for that $800 you don't have to worry about missing dependencies, errors and/or warnings. Also no thread exceptions or script errors are in existence. Everything about the locomotive is realistic; sounds, cab, running number etc. Plus you don't have to worry about backing it up just in case. Oh and did I mention, it's never obsolete and never need updates?
Pardon me if I'm a bit confused, but are you suggesting that an $800.00 brass locomotive "is realistic; sounds, cab, running number etc."? I am curious if you could show me which manf. of brass locomotives provided a product that met these criteria? Even in larger scale brass (much of which would far exceed the $800 figure pdkoester provided), manufacturers and modelers would agree that some things were slightly out of scale (either through necessity, or through mistakes made in prototyping / production), details were missing or slightly incorrect; in short, not even the highest quality brass locomotive was ever completely "realistic". As for sounds & cabs; I have no idea how a comparison can be made between the quality of the JR sounds and cabs, and one from a brass locomotive. Much as I loved my SoundTRAXX system (which, was a cost in addition to the $800 for the brass model), it never provided the same quality of sound as I get while playing Trainz. I wish I had had the skills to have the cab of my brass locomotive look even 25% of the detail of a JR cab. In fact, in most cases the cabs on a brass locomotive had to be sacrificed to make way for the DCC decoder, or the LED light board to provide for the scale gyralight, etc., etc.
And let us not forget that the time spent constantly cleaning the drive gear and wheels to ensure smooth operation, and the times when the motor would bind because of some issue or another (since no brass locomotive ever operated perfectly 100% of the time), or the time consuming chore when Mashima or ProtoWest came out with a motor upgrade to improve performance that had to be done if one wanted to make sure that your power wasn't relegated to the RIP track at the next operating session at the club... Honestly, I could go on and on. Suffice it to say there is no defensible way to make the claim that a brass locomotive, whether it be $800 or $8000, is somehow a flawless piece of engineering that requires no work or maintenance, and is superior in all respects to what you get when you purchase a $5 (or $25, or whatever you may have) JR locomotive. Is it possible you will have issues with the JR model? Of course. But no more so, I would warrant, than you could potentially have with a brass locomotive fresh out of the box.
But, again, perhaps I am just misunderstanding what you are trying to say. My apologies if I did.
Regards,
MSP